English: Arches of various forms as follows:— 18. The Tuscan arch, where the extrados takes the form of a pointed arch. 20. The discharging or relieving arch, built above the architrave or lintel to take off the weight of the superstructure. Illustration from 1911 Encyclopædia Britannica, article Arch.
This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.
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